Cutter chain



M. P. HOLMES CUTTER CHAIN Feb. s, 1938.

Filed July 30, 1934 Patented Feb. 8, 1938 UNITED STATES PATENT OFFICE CUTTER CHAIN Mglzl'lan 1'. Holmes, Claaemont, N. 11., assigtiiior t:

van Machinery ompany, a corpora on Massachusetts Application July 30, 1934, Serial No. 737,495 11 Claims. (cl. 262-33) This invention. relates to cutter chains, and for receiving a cutter bit, generally designated more particularlyrhas reference to improvements 6, of an improved design. A set screw 1 threaded in cutter bits and bit holders of a cutter chain within the bit block is engageable with the bit especially designed for use for mining purposes. body for securing the bit within the bit block 5 An object of this invention is to provide an socket. in a manner to be later described. In 5 improved cutter chain. Another object is to this illustrative construction, the boss 4 is cylinprovide an improved cutter bit and bit holder for drical and is supported by transverse end pora cutter chain. A further object is to provide tions 8, 8 in spaced relation with respect to a an improved mining machine cutter chain deledge 9, the latter arranged with its outer sur- 10 signed to use for kerf-forming purposes and havface in a horizontal plane parallel to a plane 1 ing improved cutter bit and bit-holding means. including the axes of the pivot pins 2, 2, the Yet another object is to provide an improved parts being so formed as to provide an opening reversible or double-ended cutter bit for use with I!) traversing the block beneath the bit socket such a cutter chain, the bit having a plurality boss 4. The transverse supporting portions 8, 8

of cutting points of an improved design, and have integral, transversely extending fin portions 15 improved positioning and holding means for po- II, II which act as clearing means for clearing sitioning the bit in the bit block and holding the cuttings from the kerf cut by the chain, and the bit in position in the block. These and other the ledge 9 cooperates with these clearing fins objects will, however, subsequently more fully in removing the cuttings from the kerf. The

appear. ledge 9 is provided with end abutment surfaces 20 In the accompanying drawing there are I2, I 2 which abuttingly engage corresponding shown, for purposes of illustration, two forms surfaces on the adjacent bit blocks as the cutwhich the invention may assume in practice. ter chain travels in its guide, for instance, in a In t drawing, guideway formed about the margin of a. plane Fig. 1 is a side elevational view of one iilustracutter bar or other suitable guide support. The 25 tive embodiment of the improved cutter chain. bosses 4 are formed on the bit blocks in different Fig, 2 i ros ti nal view t ken o line locations on different blocks with respect to a 2 2 of Fi 1, with parts in l vati n, median plane at right angles to planes includ- F 3 is 9, plan vi w of the utt h in h w; ing the pivot pin 9: es, and the sockets 5 travi Fi 1, erse these bosses in different angularly related 3 Fig. 4 is a longitudinally extending, vertical planes so as to form a staggered arrangement of sectional view taken substantially on line 4-4 the Cutter bits. in the manner Shown in of Fig. 3, with parts in elevation and with a, of a width sufficient to out n. kerf to admit the portion broken away to facilitate illustration. c n and its Cooperating guiding means- Fig. 5 is a. perspective view of the improved h Imp v t r bit comprises a body I3, 35 cutter bit. generally in the shape of a parallelogram in side Fig 6 is a d t il ti na] w t k on l elevation and rectangular in cross section, and

5-6 f Fig, 4. which has cutting points [4 and I5 formed at its Fig. 7 is a cross sectional view taken substanends at the Opposite Sides of the bit y. The

tially on li 1 of Fig, 5, points of the cutting portions are formed by cut- 40 Fig. 8 is a view similar to Fig. 4, showing a s away the body t pr id r a wardly inmodified form of n tructi clined cutting faces l6 and I1 obliquely disposed Fig. 9 is an end elevational view of the bit W -h re pect to the major axis of the bit. The block and bit shown in Fig. 8. front and rear edges of the bit body are trans- In the illustrative embodiment of the invention Versely grooved Cut y at nd 9 to pro- 45 shown in Figs. 1 to 7, inclusive, I indicates the vide abutments 20 and 2|, and one of these abutbit block, a series of which are pivotally eonments is engageable with the outer surface of the nected by pivot pins 2 directly together in e dblock to limit inward movement of the bit within to-end relation to form an endless chain, one its socket, while the other abutment underlies the ;0 end 3 of each bit block overlapping the end of inner end of the setsc s t e en if the tthe adjacent bit block in the manner shown in screw were sligh ly 10056. e it could not be in- Fig. 2. Formed as an integral portion of the bit advertently released from its socket. The cutting block is a boss 4 arranged with its longitudinal portions at the ends of the bit have converging axis parallel to the median line of the chain, side surfaces 22, 22 forming cutting points of 5 and this boss is traversed by a rectangular socket generally triangular shape in cross section, as

shown in Fig. 6, thereby to provide a generally triangularshaped front cutting face, a design whereby an improved cutting action is attained even when the cutting point becomes slightly dull. when the bit is within its socket, the front and rear end faces of the bit body lie in parallel planes extending transversely of the bit block at right angles to a plane including the axes of the pivot pins. Viewed in side elevation, it will be noted that the cutting away of the bit as at l8 and It provides side surfaces lying in the sides of a parallelogram and which lie in parallel planes respectively including the cutting points l4 and In the modification shown in Figs. 8 and 9, the cutter bit 8 is identical to that disclosed in the form above described, but, in this instance, is associated with a different type of chain structure. The chain, in this form of the invention, comprises a series of end-abutting bit blocks 30 pivotally connected by pivot pins 3| to strap links 32. I

The bit block body is traversed by a bit socket 33 terminating at its inner end with an enlarged opening 34 traversing the bit block. The ends of the bit block are provided with inclined abutment surfaces 35 which are adapted abuttingly to en'- gage correspondingly shaped surfaces on the next adjacent bit blocks. The bit is held within the bit block socket by a setscrew 36 in the same manner as in the form of the invention above described; and otherwise this form of the invention is the same.

As a result of this invention, it will be noted that an improved cutter chain is provided, having improved cutter bit and bit-holding means whereby the bit is held within its bit block in an improved manner. It will further be noted that an improved cutter bit of the double-ended type is provided, having improved means for positioning the bit with respect to the bit block socket and for securing the bit within the bit block socket. It will also be evident that by providing the cutting portions of the bit with the particular shape of cutting face and cutting points disclosed, an improved cutting action is attained, while the wearing qualities of the bit are greatly increased. These and other uses and advantages of the improved cutter chain will be clearly apparent to those skilled in the art.

While in this application there are described two forms which the invention may assume in practice, it will be understood that these forms are shown for purposes of illustration and that the invention may be further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A double-ended, reversible cutter bit having a narrow elongated body terminating in cutting portions at its opposite ends and provided, in side elevation, with end and side surfaces lying in the sides of a parallelogram, and rectangular in cross section, the cutting portions at the opposite ends of the bit body providing cutting points at the opposite sides of the bit, and means formed on the opposite sides of the bit body viewed in side elevation, providing abutments respectively engageable with an outer surface of a bit block for limiting inward movement of the bit within a bit block socket and with means for holding the bit within a bit block socket.

2. A double-ended, reversible cutter bit having a narrow elongated body terminating in cutting portions at its opposite ends and provided, in side elevation, with end and side surfaces lying in the sides of a parallelogram, and rectangular in cross section, the cutting portions at the opposite ends of the bit body providing cutting points at the opposite sides of the bit, and means formed on the opposite side surfaces of the bit body viewed in side elevation, providing abutments respectively engageable with an outer surface ofa bit block for limiting inward movement of the bit.within a bit block socket and with means for holding the bit within a bit block socket, said latter abutment means preventing release of the bit from a bit block socket even when the bit holding means is slightly released.

3. In a cutter chain, a bit block having a bit receiving socket, and a double-ended, reversible cutter bit of narrow elongated form receivable in said bit block socket, said bit having cutting portions at its opposite ends terminating in cutting points and also having sides lying in parallel planes passing through said cutting points respectively, and means on the body of said bit between said cutting portions and engageable with the outer surface of the bit block for limiting inward movement of the bit within the bit block socket, said' limiting means being arranged on the bit body outside of the parallel planes including said sides of the bit and the cutting points of said cutting portions. v

4. In a cutter chain, a bit block having a bit receiving socket, and a double-ended, reversible cutter bit of narrow elongated form receivable in said bit block socket, said bit having cutting portions at its opposite ends terminating in cutting points and also having sides lying in parallel planes passing through said cutting points respectively, and means on the body of said bit between said cutting portions and respectively engageable with the outer surface of the bit block for limiting inward movement of the bit within the bit block socket and with holding means for preventing release of the bit from the bit block socket even when the holding means is slightly released, said limiting means being arranged on the bit body outside of said parallel planes including said sides of the bit and the cutting points of said cutting portions.

5. A cutter chain comprising a bit block having a bit-receiving socket, a double-ended, reversible cutter bit insertable in said socket, said bit having a narrow elongated body terminating in cutting portions at its opposite ends and provided, in side elevation, with end and side surfaces lying in the sides of a parallelogram, and of rectangular cross section, means on said bit block engageable with one such side surface of the bit body for clamping the opposed side surface to one wall of the bit block socket, and means on the bit body engageable with the outer surface of the bit block lar cross section, means on said bit block engageable with one such side surface of the bit body for clamping its opposed side surface to one wall of the bit block socket, means on the bit bodyengageable with said clamping means for preventing inadvertent release of the bit from its socket even when said clamping means is slightly released, and means on said bit body engageable with an outer surface of the bit block for limiting movement of the bit upon insertion thereof within the bit block socket.

7. A cutter bit having a narrow elongated body terminating in cutting portions at its opposite ends and provided, in side elevation, with end and side surfaces lying in the sides of a parallelogram, and of rectangular cross section, the cutting portions at its opposite ends providing cutting points at the opposite sides of the bit body and having plane cutting faces inclined with respect to the parallel side surfaces of the bit body, and means formed on said parallel sides of the bit body providing abutments respectively for limiting inward movement of the bit within a socket of a bit block and engaging means for holding the bit within a bit block socket.

8. A cutter chain comprising a. bit block hav-' ing a bit-receiving socket, a double-ended, reversible cutter bit insertable in said bit block socket, said bit having a body of narrow elongated form terminating in cutting portions at its opposite ends and provided with abutment means spaced longitudinally of the bit body, one abutment means adjacent each cutting portion of the bit, said bit being reversible end for end within said bit block socket, and said abutment means which are respectively the nearer to the thenactive cutting portions selectively engaging an outer surface on the bit block for limiting insertive movement of the bit within when said bit is in either of its end for end positions within said socket.

9. A cutter chain comprising a bit block having a bit-receiving socket, a double-ended, reversible cutter bit insertable in said bit block socket, said bit having a body of narrow elongated form terminating in cutting portions at its opposite ends and provided with abutment means spaced longitudinally of the bit body, one abutment means adjacent each cutting portion of the bit, said bit said bit block socket being reversible end for end within said bit block socket, and said abutment means which are respectively the nearer to the themactivecutting portions selectively engaging an outer surface on the bit block for limiting insertive movement of the bit within said, bit block socket when said bit is in either of its end for end positions within said socket, and holding means engageable with the bit body for holding the bit within said bit block socket when said bit is in either of its end for end positions, said holding means engageable with the abutment means which are not acting to limit bit insertion respectively when said bit is in either of its end for end positions within said socket. 1

10. A cutter chain comprising a bit block having a socket, a double-ended, reversible cutter bit insertable in said bit-receiving socket, said bit having a narrow elongated body terminating in cutting portions at its opposite ends and provided, in side elevation, with end and side surfaces lying in the sides of a rhomboid, means on said block engageable with one such side surface of the bit body for clamping the opposed side surface to one wall of the bit block socket, and means on the bit body engageable with an outer surface of the bit block for limiting insertive movement of the bit within the bit block socket.

11. A double-ended, reversible cutter bit having a narrow elongated body terminating in cutting portions at its opposite ends and provided, in side elevation, with end and side surfaces lying in the sides of a rhomboid, the cutting portions at the opposite ends of the bit body providing cutting points at the opposite sides of the bit, and means formed on the opposite side surfaces of the bit body viewed in side elevation, providing abutments respectively engageable with an outer surface of a bit block for limiting insertive movement of the bit within a bit block socket and with means for holding the bit within a bit block socket.

MORRIS P. HOLMES. 

